Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fe1e56c32f5ea25…

MALICIOUS

PDF

78.0 KB Created: 2021-03-28 20:20:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 583ac533e559a4ac4633341b93d1135f SHA-1: 10aa4182931b68ed2b5509f1ae16a8648e163d6b SHA-256: 5fe1e56c32f5ea259942ce86268aa03503797422af11ce8815c14f885bd05676
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document exhibits characteristics of a link farm, containing numerous external URLs pointing to potentially malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://druttle.ru/award?keyword=importance+of+folic+acid+in+pregnancy+pdf PDF link annotation
    • https://cdn.sqhk.co/libobivole/ajfvBe0/36468827689.pdfIn PDF document text
    • https://cdn.sqhk.co/dasofuduveje/bBidugc/jibemutafegodovexufegimu.pdfIn PDF document text
    • https://cdn.sqhk.co/gabamulijawe/hgDuhcb/87786660610.pdfIn PDF document text
    • http://copyright-securityx.com/android_beaming_service_nedirl64mu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463529/normal_6042c1faabad2.pdfIn PDF document text
    • https://cdn.sqhk.co/velabolo/jfhawgc/pixel_car_racer.pdfIn PDF document text
    • http://levelupguild.com/woxurupobno3ax.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496014/normal_601bcfa944f43.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484990/normal_5fc686b993437.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490244/normal_604dd3c74b879.pdfIn PDF document text
    • https://cdn.sqhk.co/nemuvefik/ZnJhjlP/41661645864.pdfIn PDF document text
    • http://smartradiobf.ru/viturudisejinusebokukaxl1qo.pdfIn PDF document text
    • https://cdn.sqhk.co/tizalenifo/e4GkOib/running_shoes_for_men_asics.pdfIn PDF document text
    • http://sodaapp.pro/tomoralasce0ri.pdfIn PDF document text
    • http://itasummer.fun/gefitokobh88k.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c3d7ecb-6edb-4615-8a77-2bf6dace74d1/fender_super_champ_xd_mods_part_1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e150fde-bdad-4b20-90af-26f08f4b30de/bunipevif.pdfIn PDF document text
    • https://724418e0-3ace-43c1-abd8-628b4820fc71.filesusr.com/ugd/6df952_a3acb1e98a9542589c41a9bf1c0769a8.pdf?index=trueIn PDF document text
    • https://737c154f-ca75-4484-807d-9d5c19d76377.filesusr.com/ugd/7e84b7_199373d3372c4835b90ad023dc2dbd65.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e235d824-e5fd-4dce-814e-e2b1580317f0/im_only_one_call_away_piano_sheet_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70532d08-1014-41ba-b76d-9c7ff575d9b6/the_narrative_life_of_frederick_douglass_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7cfbdc2-b20b-4286-be6e-3af7fb410e13/bofuwiwiwokudajirewakov.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AF 5336 bytes
SHA-256: 56474f61b3c4b75859ebfb2b454a37b87d1356a0a3b7a9d26201f02a73421125
font_01_sfnt_off000106c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C8 10476 bytes
SHA-256: c8a731d6782030737ea6e0a9da2c03714644259473727c2b9d19cef9e1c8b214